US3515837A - Heat generating pipe - Google Patents

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US3515837A
US3515837A US3515837DA US3515837A US 3515837 A US3515837 A US 3515837A US 3515837D A US3515837D A US 3515837DA US 3515837 A US3515837 A US 3515837A
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pipe
current
heat
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generating
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Masao Ando
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JNC Corp
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B6/00Heating by electric, magnetic, or electromagnetic fields
    • H05B6/02Induction heating
    • H05B6/10Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/105Induction heating apparatus, other than furnaces, for specific applications using a susceptor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L53/00Heating of pipes or pipe systems; Cooling of pipes or pipe systems
    • F16L53/30Heating of pipes or pipe systems
    • F16L53/34Heating of pipes or pipe systems using electric, magnetic or electromagnetic fields, e.g. using induction, dielectric or microwave heating

Description

:June2, 1j970 I MAsAo ANDO 3 I HEAT GENERATING PIPE Filed March 39, 1967 2 Sheet's-Shegt 1 INVENTOR H64 BY M. 9L

ATTORNEY June 2, 1970 MASAO ANDO HEAT GENERATING PIPE 2 Sheets-Sheet 2 Filed March 130, 1967 m Cl INVENTOR M4340 ANDO ATTORNEY United States Patent 3,515,837 HEAT GENERATING PIPE Masao Ando, Yokohamashi, Japan, assignor to Chisso Corporation, Osaka, Japan Continuation-impart of application Ser. No. 538,040, Mar. 28, 1966. This application Mar. 30, 1967, Ser. No. 627,086 The portion of the term of the patent subsequent to Nov. 12, 1985, has been disclaimed Claims priority, application Japan, Apr. 1, 1966, 41/ 20,427 Int. Cl. H05b 5/00, 9/00 U.S. Cl. 21910.49 10 Claims ABSTRACT OF THE DISCLOSURE A heat generating pipe comprising an arrangement including at least one pipe of ferromagnetic metal, the ends of which are electrically connected to form a Secondary current circuit and an electric conductor line connected to a source of AC. supply, inserted within said pipe throughout the entire length of said pipe in electrically insulated relation from said pipe and a method for heating various objects by use of said heat generating pipe which generates heat by the induction current concentrated solely on the inner wall portion of said pipe and causing substantially no electric potential to appear on the outer wall portion of said pipe.

This application is a continuation-in-part of application Ser. No. 538,040, filed Mar. 28, 1966, now Pat. No. 3,410,977, issued Nov. 12, 1968.

CROSS-REFERENCE Japanese Pat. No. 460,224 corresponding to U.S.P. 3,293,407; Japanese patent application No. 20,126/ 1965 corresponding to US. Ser. No. 538,040, now Pat. No. 3,410,977.

BRIEF SUMMARY OF THE INVENTION This invention relates to a heat generating pipe comprising an arrangement including at least one pipe of ferromagnetic metal, the ends of which are electrically connected to form a secondary current circuit and an electric conductor line connected to a source of AC. supply, inserted within said pipe throughout the entire length thereof in its longitudinal direction in electrically insulated relation from said pipe and a method for heating various objects with said heat generating pipe by concentrating the induction current solely on the inner wall portion of said pipe and causing substantially no electric potential to appear on the outer wall portion of said pipe.

DETAILED EXPLANATION It is an object of the present invention to provide an electric heat generating pipe having an extremely-simple construction but a high energy efficiency. It is another object of the present invention to provide a heat generating pipe which is not necessary to be electrically insulated from a supporting material thereof or a material to be heated therewith in its installation and easy in its maintenance because there is substantially no electricpotential appearing on the outer surface and hence substantially no current leakage even if it is installed in the direct contact with such a supporting material or a material to be heated. It is a further object of the present invention to provide a heat generating pipe which can be readily installed with a highest grade of reliability and affording easy maintenance for the purpose of heating the surface of high speed road or the run field of air craft Where freezing or snow drift must be avoided, the wall 3,515,837 Patented June 2, 1970 ice or floor of the building and, as a tracing pipe, a transportation pipe for viscous liquid or the like.

It is still a further object of the present invention to provide a heat generating pipe which has overcome the difficulty of corrosiveness at the junction point between the different materials, the ferromagnetic metal and the conductor which has been encountered in the heat generating pipe of the prior inventions of the present inventor.

These objects and other advantages can be attained by the heat generating pipe of the present invention.

The heat generating pipe of the present invention consists in the arrangement including one or more than one pipe of ferromagnetic metal having an inner wall portion, outer surface portion and a wall thickness greater than twice the penetration depth of alternating current flow through the inner wall portion of said pipe and a conductor line connected to a source of AC. supply and inserted within said pipe throughout the entire length thereof in electrically insulated relation from the inner wall portion of said pipe, the ends of said pipe being electrically connected with another conductor having an impedance as low as possible in such a way that the alternating current flowing through the conductor line induces induction current which flows solely through the inner wall portion of said pipe on account of the skin efiect, whereby said pipe is heated and the outer surface portion of said pipes receives solely the heat so generated Without any substantial amount of electric current flow therethrough, thereby any provision of electrically insulating means on the outer surface of said pipe being obviated.

FIG. 1 is a schematic diagram showing a longitudinal cross-sectional view of one embodiment in accordance with the present invention;

FIG. 2 is a schematic diagram showing a longitudinal cross-sectional view of another embodiment of the present invention;

FIG. 3 is a longitudinal cross-sectional view of a further embodiment of the present invention;

FIG. 4 is a longitudinal cross-sectional view of still another embodiment of the present invention;

FIG. 5 is a longitudinal cross-sectional view of a further embodiment of the present invention;

FIG. 6 is a longitudinal cross-sectional view of another embodiment of the present invention; and

FIG. 7 is a longitudinal cross-sectional view of still another embodiment of the present invention.

It is well-known that when an alternating current flows through a conductor, the current concentrates on the surface of the conductor and shows a so-c'alled skin effect. When the skin effect is pronounced, the depth of the skin S (cm.) in which a current flows can be expressed by a formula 8 '030 D uf wherein D (cm.) is an inside diameter of said pipe, t (cm.) is its thickness and l (cm.) is its length, are satisfied. When a commercial steel pipe is used as a pipe of ferromagnetic metal and an alternating current of commercial frequency (50 or 60 cycles) is applied, the depth of the skin calculated by the formulas is about 1 mm. Accordingly, there will be substantially no current flow on the surface of a pipe so long as its thickness is more than 2 mm.

In the heat generating pipe for oil transportation pipe disclosed by the present inventor in the specification of Japanese Pat. No. 460,224 corresponding to U.S.P. No. 3,293,407 and heating elements also disclosed by the present inventor in a copending Japanese patent application No. 20,126/1965 corresponding to US. S.N. 538,040, now Pat. No. 3,410,977, there are proposed a circuit of heat generating pipe consisting of an insulated conductor inserted within ferromagnetic metal pipe throughout the entire length thereof, connected to a source of A.C. supply, and said ferromagnetic metal pipe, as a return path to said source of A.C. supply, formed by connecting the end of said conductor with the end of said pipe at the side far from said source of A.C. which generates heat by the electric resistance of the current flowing only on the inner wall portion of said pipe on account of the skin effect.

FIG. 1 is a schematic diagram showing a longitudinal cross-section view and an electric connection of the abovementioned heat generating pipe. In FIG. 1, 1 is a source of A.C. supply and 2 is a ferromagnetic pipe. 3 is a conductor line, connected to a terminal 4 of the source 1, inserted within the ferromagnetic pipe 2 throughout the entire length thereof in electrically insulated relation from the inner wall of said pipe. The end of the conductor line is electrically connected to the end 5 of said pipe at the side far from the source. The other end 8 of said pipe is connected to the other terminal of the source 1 with a conductor line 7, thus forming an electric circuit starting from the terminal 4, passing through the conductor line 3, the pipe 2 and the conductor line 7, and ending at the terminal 6. When an alternating current is supplied to this circuit from the source 1, the current flowing through the pipe 2 is concentrated on the inner wall portion of said pipe, and hence there is substantially no potential appearing on the outer surface of said pipe. For example, another conductor line is connected at 10 and 11, any two points, on the outer surface of the pipe and to a voltmeter 12. The meter does not show any appreciable potential.

FIG. 2 is a schematic diagram showing a longitudinal cross-sectional view of the heat generating pipe whose electric connection is not satisfactory. In FIG. 2, 13 is a source of A.C. supply and 14 is a ferromagnetic pipe. When a conductor line 16 insulated relative to the pipe 14 is passed through the pipe 14 on its one way, placed outside the pipe on its return way and both of its ends are connected to the terminals and 17 to form a circuit. When an alternating current is supplied to this circuit, a secondary current having the substantially same strength but whose direction of flow is opposite is induced on the inner wall portion of said pipe. This current flows from the inner wall portion of said pipe, through one end of said pipe to the outer surface 19 of said pipe as shown by arrow marks. Thus a circuit is formed between the inner wall portion and the outer surface portion of said pipe. Accordingly, the secondary current leaks into a body contacting the outer surface of said pipe.

FIG. 3 is a schematic diagram showing the longitudinal cross-sectional view and electric connection of the one embodiment of the present heat generating pipe. In this figure, 20 is a source of A.C. supply, 21 is a ferromagnetic metal pipe and 22 is a conductor line electrically insulated relative to said pipe, connected to both the terminals 23 and 24 of the source at both its ends and inserted within said pipe 21, thus forming a primary circuit. Both the ends of said pipes 25 and 26 are electrically connected 'with another conductor having an impedance close to zero, less than l0 t2, to form a secondary circuit. When an alternating current is supplied to the primary circuit, a secondary current is induced in the secondary circuit formed by said pipe 21 and the conductor 27. On account of the skin effect, the secondary current flowing through said pipe 21 is concentrated on the inner wall portion, and outside of said pipe, it flows through the conductor 27, hence there is substantially no potential appearing on the outer surface so long as said pipe 21 satisfies the conditions expressed by the above-mentioned Equation 2. Accordingly, even when said pipe is brought to contact with a material to be heated or a supporting material, there is substantially no leakage of current.

As can be seen from the illustrations of FIGS. 3 and l, the present heat generating pipe is different from that of the prior applications of the present inventor and has overcome the electrolytic corrosion problem at the junction points between the ferromagnetic pipe and the conductor, encountered in the heat generating pipe of the prior applications.

It is ideal that the conductor connecting both the ends of ferromagnetic metal pipe has zero impedance but there is actually no such conductor. So, in order to make the impedance of this conductor as low as possible, such an arrangement is taken that both the ends of said pipe is located as close as possible thereby to reduce the length and the electric resistance of the conductor while using as good a conductor as possible. The above-mentioned arrangement is generally economical also in the point of installation of the heat generating pipe.

As embodiments of the above-mentioned concept, when one heat generating pipe is to be used in the single phase A.C. supply, said pipe may take advantageously U-form as shown in FIG. 4, wherein 28 is a source of A.C. supply and 29 is a ferromagnetic metal pipe bent in U-form. Through said pipe, there is passed a conductor line 30 electrically insulated relative to the inner wall of said pipe 29, both the ends of which are connected toboth the terminals of the source 28 to form a primary circuit. Both the ends 31 and 32 of said U-form pipe 29 positioned at a close distance from each other, are connected with a low impedance conductor 33 to form a secondary circuit. When an alternating current is supplied to the primary circuit, a current having the substantially same strength but whose direction is opposite to the primary, is induced in the secondary circuit as indicated by arrow in the drawing. The secondary current flowing through said pipe 29 is concentrated on the inner wall portion of the pipe and there is substantially no potential appearing on the outer surface of the pipe so long as the conditions expressed by the Equation 2 are satisfied. Even if other materials are brought to direct contact with the outer surface of the pipe 29, there is practically no leakage of current to these materials.

Besides the above-mentioned U-form pipe as a method for reducing the impedance of the conductor connecting the ferromagnetic pipe in the practice of the present invention using a single phase current, it is also possible to use a single pipe bent an odd number of times in U-form or an even number of pipes having nearly the same length and arranged in parallel position.

FIG. 5 shows a longitudinal cross-sectional View and electric connection of the case where two ferromagnetic pipes are used as the heat generating pipe and a single phase A.C. is supplied from the source. In this figure, 34 is a source of A.C. supply and 35 and 35 are two ferromagnetic pipes arranged in parallel relation. Within these pipes, there is passed a conductor line 36 which is electrically insulated relative to the pipes and whose ends are connected to the terminals of the source 34. Further both the ends 37 and 38 of the pipe 35 are connected to both the ends 37 and 38 of the pipe 35' with low impedance conductors 39 and 40 thus to form a secondary circuit in the order of arrangement, the pipe 35, the end of the pipe 37, the conductor 39, the end of the pipe 37, the pipe 35', the end of the pipe 38, the conductor 40 and the end of the pipe 38. When an A.C. current is supplied to the primary circuit, the secondary current induced in the secondary circuit is concentrated solely on the inner wall portion of these pipes on account of the skin effect while it flows the inner parts of the pipes 35 and 35', and any substantial amount of electric potential does not appear on the outer surface of the pipe so long as the conditions of Equation 2 are satisfied.

Three phase alternating current may be also used in the source. FIG. 6 shows the longitudinal cross sectional view of three heat generating pipes and their electric connection in the case where a three phase A.C. current is supplied from a source. In this figure, 41 is a source of A.C. supply, and 42, 42' and 42" are three ferromagnetic pipes arranged in parallel relation to each other. Each one of conductors 43, 43 and 43", connected to each one of the terminals of the source is passed through each one of the pipes 42, 42' and 42 in the relation insulated relative to these pipes and these three conductors are connected at a point 44 to form a primary circuit. Both the ends of pipes 42 and 42', and both the ends of pipes 42' and 42" are connected with low impedance conductors 45 and 46, and 45' and 46, respectively to form a secondary circuit. When a three phase A.C. is supplied to the primary circuit, there is induced in the secondary circuit an induction current which is concentrated during the path of the ferromagnetic pipes solely on the inner wall portion of the pipe. There is substantially no electric potential appearing on the outer surfaces of the pipes.

As above-explained, the heat generating pipe of the present invention has a very simple construction, and the metal pipe possessing such a extent of magnetic property as that of commercial steel pipe will be sufficient. For example when a commercially available steel pipe is used, it will be sufficient so long as its thickness is more than 2 mm. Even the alternating current possessing commercial frequencies can be sufficiently used with such a pipe. There is no special need of producing an alternating current of higher frequency.

As conductors for the primary circuit, a commercially available electric wire insulated with natural or synthetic rubber, polyolefins such as polyethylene, polypropylene, or the like, polyhaloolefins such as polwinyl chloride, poly fluoroethylene or the like, polyamide resin, polyester resin, glass fibers or the like are illustrated. When such a wire is used, there is no need of adding further insulation to the part between the ferromagnetic metal pipe and the conductor.

The temperature range in which the present heat generating pipe can be applied depends upon the kinds of insulating material. For example, wires insulated with natural or butadiene type synthetic rubber or polyvinyl chloride are preferably used at a temperature lower than 60 C., and those insulated with polypropylene can be used at a temperature higher than 100 C. When a higher temperature than 150 C. is necessary, the use of polyfluoroethylene as an insulator is preferable.

As explained so many times in the foregoing description, since any substantial amount of electric potential does not appear on the outer surface of the pipe, it is possible to install the heat generating pipe by integrally contacting it to the material to be heated, by tightly binding it with metal bands, or by welding it to the material to be heated or the like. Accordingly, the method of installation is extremely simple. With this simplicity of installation together with the simple construction, the present heat generating pipe affords an economical heating method of highest grade of reliability, and easy maintenance.

Several examples are given together with its installation method as to the cases of heating method wherein the present heat generating pipe is applied.

When the present heat generating pipes are applied to the surface of wall or floor, the road surface or the run field of aircraft where snow drifting or freezing is abominable, they are arranged at an appropriate distance as a part of reinforcement steel of ferroconcrete and covered with concrete in building the construction. Another useful commercial application of the present heat generating pipe is the heating and maintenance of elevated temperature for the transportation pipe of liquid particularly the material which solidifies at a low temperature, e.g. soli-d paraflin, asphalt, naphthalene, glacial acetic acid, highly concentrated aqueous solution of caustic soda or the material which is so viscous that loses its fluidity at a low temperature e.g. a heavy oil or a certain kind of crude oil. In such a case the heat generating pipe can be brought to intimate contact with the transportation pipe e.g. by binding with metal bands, by welding it with the wall of the transportation pipe. The welding method is preferable because it enables to improve the heat transmission.

What is claimed is:

1. A heat generating pipe having an arrangement including a primary circuit of an electric conductor line connected to a source of A.C. supply and inserted within at least one pipe of ferromagnetic metal throughout the entire length thereof in electrically insulated relation from the inner wall portion of said pipe and a secondary circuit consisting of said at least one pipe of ferromagnetic metal and at least one conductor having an impedance as low as possible and connecting the ends of said pipe, the secondary alternating current induced in the secondary circuit by the primary current being concentrated on the inner wall portion of said pipe on account of the skin effect while satisfying the relations expressed by equations,

s=5030 l f wherein S is a penetration depth (cm.) of the current flowing the pipe of ferromagnetic metal on account of the skin effect, p is a resistivity (Kl-cm.) of the material of said pipe, ,u. is the magnetic permeability, f is a frequency (cycles/sec.) of said pipe, D is an inside diameter (cm) of said pipe and l is a length (cm.) of said pipe, whereby said pipe is heated by the secondary current flowing through the inner wall portion thereof on account of the skin effect and the outer surface portion of said pipe receives solely the heat so generated without any substantial amount of electric current flow therethrough.

2. A heat generating pipe according to claim 1, wherein said pipe is one pipe bent an odd number of times in U form.

3. A heat generating pipe according to claim 1, wherein said pipe is a plural number of pipes and both the ends of the pipes are located at as close positions as possible.

4. A heat generating pipe according to claim 1, wherein said pipe is a steel pipe.

5. A heat generating pipe according to claim 1, wherein said source of A.C. supply supplies a single phase A.C.

6. A heat generating pipe according to claim 1, wherein said source of A.C. supply supplies a three phase A.C.

7. A method for heating a liquid transportation pipe comprising heating said pipe with the tracing of a heat generating pipe having an arrangement including a primary circuit of an electric conductor line connected to a source of A.C. supply and inserted within at least one pipe of ferromagnetic metal throughout the entire length thereof in electrically insulated relation from the inner wall portion of said pipe and a secondary circuit consisting of said at least one pipe of ferromagnetic metal and at 7 least one conductor having an impedance as low as possible and connecting the ends of said pipe, the secondary alternating current induced in the secondary circuit by the primary current being concentrated on the iner wall portion of said pipe on account of the skin effect while satisfying the relations expressed by equations,

wherein S is a penetration depth (cm.) of the current flowing the pipe of ferromagnetic metal on account of the skin effect, p is a resistivity (fl-cm.) of the material of said pipe, a is a magnetic permeability, f is a frequency (cycles/sec.) of said pipe, D is an inside diameter (cm.) of said pipe and l is a length (cm.) of said pipe, whereby said pipe is heated by the secondary current flowing through the inner wall portion thereof on account of the skin effect and the outersurface portion of said pipe receives solely the heat so generated without any substantial amount of electric current flow therethrough.

8. A method for heating a surface of wall or floor of construction comprising heating said surface with a heat generating pipe having an arrangement including a primary circuit of an electric conductor line connected to a source of AC. supply and inserted within at least one pipe of ferromagnetic metal throughout the entire length thereof in electrically insulated relation from the inner wall portion of said pipe and a secondary circuit consisting of said at least one pipe of ferromagnetic metal and at least one conductor having an impedance as low as possible and connecting the ends of said pipe, the secondary alternating current induced in the secondary circuit by the primary current being concentrated on the inner wall portion of said pipe on account of the skin effect While satisfying the relations expressed by equations,

wherein S is a penetration depth (cm.) of the current flowing the pipe of ferromagnetic metal on account of the skin effect, p is a resistivity (Q-cm.) of the material of said pipe, ,u. is the magnetic permeability, f is a frequency (cycles/sec.) of said pipe, D is an inside diameter (cm.) of said pipe and l is a length (cm.) of said pipe, whereby said pipe is heated by the secondary current flowing through the inner wall portion thereof on account of the skin effect and the outer surface portion of said pipe receives solely the heat so generated without any substantial amount of electric current flow therethrough.

9. A method for heating a surface of road comprising heating said surface with a heat generating pipe having an arrangement including a primary circuit of an electric conductor line connected to a source of AC. supply and inserted within at least one pipe of ferromagnetic metal throughout the entire length thereof in electrically insulated relation from the inner Wall portion of said pipe and a secondary circuit consisting of said at least one pipe of ferromagnetic metal and at least one conductor having an impedance as low as possible and connecting the ends of said pipe, the secondary alternating current induced in the secondary circuit by the primary current being concentrated on the inner wall portion of said pipe on account of the skin effect while satisfying the relations expressed by equations,

IL 8-5030 Mf wherein S is a penetration depth (cm.) of the current flowing the pipe of ferromagnetic metal on account of the skin effect, p is a resistivity (St-cm.) of the material of said pipe, ,1 is the magnetic permeability, f is a frequency (cycles/sec.) of said pipe, D is an inside diameter (cm.) of said pipe and l is a length (cm.) of said pipe, whereby said pipe is heated by the secondary current flowing through the inner wall portion thereof on account of the skin effect and the outer surface portion of said pipe receives solely the heat so generated without any substantial amount of electric current flow therethrough.

10. A method for heating a run field of aircrafts comprising heating said run field with a heat generating pipe having an arrangement including a primary circuit of an electric conductor line connected to a source of AC. supply and inserted Within at least one pipe of ferromagnetic metal throughout the entire length thereof in electrically insulated relation from the inner Wall portion of said pipe and a secondary circuit consisting of said at least one pipe of ferromagnetic metal and at least one conductor having an impedance as low as possible and connecting the ends of said pipe, the secondary alternating current induced in the secondary circuit by the primary current being concentrated on the inner wall portion of said pipe on account of the skin effect while satisfying the relations expressed by equations,

wherein S is a penetration depth (cm.) of the current flowing the pipe of ferromagnetic metal on account of the skin effect, p is a resistivity (SI-cm.) of the material of said pipe, ,1. is the magnetic permeability, is a frequency (cycles/sec.) of said pipe, D is an inside diameter References Cited UNITED STATES PATENTS 2,543,882 3/1951' Tice 219 10.49 2,635,168 4/1953 Lerza etal 219-4049 3,410,977 11/1968 Ando 219-10.49

JOSEPH V. TRUHE, Primary Examiner L. H. BENDER, Assistant Examiner US. Cl. X.R. 2l9--6.5, 10.51

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3622731A (en) * 1969-07-04 1971-11-23 Chisso Corp Flexible heat-generating device
US3706872A (en) * 1970-05-15 1972-12-19 William J Trabilcy System for electrically heating fluid-conveying pipe lines and other structures
US3780250A (en) * 1971-11-02 1973-12-18 Chisso Corp Apparatus for heating the surface of constructions
US3974398A (en) * 1971-01-18 1976-08-10 Othmer Donald F Wire and steel tube as AC cable
US3983360A (en) * 1974-11-27 1976-09-28 Chevron Research Company Means for sectionally increasing the heat output in a heat-generating pipe
US4091813A (en) * 1975-03-14 1978-05-30 Robert F. Shaw Surgical instrument having self-regulated electrical proximity heating of its cutting edge and method of using the same
US4207896A (en) * 1970-08-13 1980-06-17 Shaw Robert F Surgical instrument having self-regulating dielectric heating of its cutting edge
EP0036322A1 (en) * 1980-03-18 1981-09-23 Chisso Engineering CO. LTD. Compact induced-current heat-generating pipe system and construction incorporating it
US4303826A (en) * 1979-02-21 1981-12-01 Chisso Corporation Shielded skin-effect current heated pipeline
WO1982003305A1 (en) * 1981-03-16 1982-09-30 Ass Iris Shielded heating element having intrinsic temperature control
US4364390A (en) * 1975-03-14 1982-12-21 Shaw Robert F Surgical instrument having self-regulating dielectric heating of its cutting edge and method of using the same
US4408117A (en) * 1980-05-28 1983-10-04 Yurkanin Robert M Impedance heating system with skin effect particularly for railroad tank cars
EP0107927A1 (en) * 1982-09-30 1984-05-09 Metcal Inc. Autoregulating electrically shielded heater
US4617449A (en) * 1981-10-22 1986-10-14 Ricwil, Incorporated Heating device for utilizing the skin effect of alternating current
US4645906A (en) * 1985-03-04 1987-02-24 Thermon Manufacturing Company Reduced resistance skin effect heat generating system
US4695713A (en) * 1982-09-30 1987-09-22 Metcal, Inc. Autoregulating, electrically shielded heater
US4791262A (en) * 1986-07-07 1988-12-13 Chisso Engineering Co Ltd Voltage transformer type electric fluid heater
GB2244414A (en) * 1990-05-24 1991-11-27 Victor Cooper Heating
US5480397A (en) * 1992-05-01 1996-01-02 Hemostatic Surgery Corporation Surgical instrument with auto-regulating heater and method of using same
US5480398A (en) * 1992-05-01 1996-01-02 Hemostatic Surgery Corporation Endoscopic instrument with disposable auto-regulating heater
US5593406A (en) * 1992-05-01 1997-01-14 Hemostatic Surgery Corporation Endoscopic instrument with auto-regulating heater and method of using same
US5611798A (en) * 1995-03-02 1997-03-18 Eggers; Philip E. Resistively heated cutting and coagulating surgical instrument
US6278095B1 (en) 1999-08-03 2001-08-21 Shell Oil Company Induction heating for short segments of pipeline systems
US6278096B1 (en) 1999-08-03 2001-08-21 Shell Oil Company Fabrication and repair of electrically insulated flowliness by induction heating
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US6509557B1 (en) 1999-08-03 2003-01-21 Shell Oil Company Apparatus and method for heating single insulated flowlines
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US20110132661A1 (en) * 2009-10-09 2011-06-09 Patrick Silas Harmason Parallelogram coupling joint for coupling insulated conductors
US20110134958A1 (en) * 2009-10-09 2011-06-09 Dhruv Arora Methods for assessing a temperature in a subsurface formation
US20110180529A1 (en) * 2010-01-25 2011-07-28 Schlipf Andreas Electric heating device
US8151880B2 (en) 2005-10-24 2012-04-10 Shell Oil Company Methods of making transportation fuel
US8151907B2 (en) 2008-04-18 2012-04-10 Shell Oil Company Dual motor systems and non-rotating sensors for use in developing wellbores in subsurface formations
US8220539B2 (en) 2008-10-13 2012-07-17 Shell Oil Company Controlling hydrogen pressure in self-regulating nuclear reactors used to treat a subsurface formation
WO2012159221A1 (en) 2011-05-20 2012-11-29 Bacab S.A. Electrical cable and application of this cable
US8327932B2 (en) 2009-04-10 2012-12-11 Shell Oil Company Recovering energy from a subsurface formation
US8485256B2 (en) 2010-04-09 2013-07-16 Shell Oil Company Variable thickness insulated conductors
US8586866B2 (en) 2010-10-08 2013-11-19 Shell Oil Company Hydroformed splice for insulated conductors
US8608249B2 (en) 2001-04-24 2013-12-17 Shell Oil Company In situ thermal processing of an oil shale formation
US8617151B2 (en) 2009-04-17 2013-12-31 Domain Surgical, Inc. System and method of controlling power delivery to a surgical instrument
US20140016918A1 (en) * 2011-01-28 2014-01-16 Sinvent As System and system elements for direct electrical heating of subsea pipelines
US8631866B2 (en) 2010-04-09 2014-01-21 Shell Oil Company Leak detection in circulated fluid systems for heating subsurface formations
US8701769B2 (en) 2010-04-09 2014-04-22 Shell Oil Company Methods for treating hydrocarbon formations based on geology
US8820406B2 (en) 2010-04-09 2014-09-02 Shell Oil Company Electrodes for electrical current flow heating of subsurface formations with conductive material in wellbore
US8857051B2 (en) 2010-10-08 2014-10-14 Shell Oil Company System and method for coupling lead-in conductor to insulated conductor
US8858544B2 (en) 2011-05-16 2014-10-14 Domain Surgical, Inc. Surgical instrument guide
US8915909B2 (en) 2011-04-08 2014-12-23 Domain Surgical, Inc. Impedance matching circuit
US8932279B2 (en) 2011-04-08 2015-01-13 Domain Surgical, Inc. System and method for cooling of a heated surgical instrument and/or surgical site and treating tissue
US8939207B2 (en) 2010-04-09 2015-01-27 Shell Oil Company Insulated conductor heaters with semiconductor layers
US8943686B2 (en) 2010-10-08 2015-02-03 Shell Oil Company Compaction of electrical insulation for joining insulated conductors
US9016370B2 (en) 2011-04-08 2015-04-28 Shell Oil Company Partial solution mining of hydrocarbon containing layers prior to in situ heat treatment
US9033042B2 (en) 2010-04-09 2015-05-19 Shell Oil Company Forming bitumen barriers in subsurface hydrocarbon formations
US9048653B2 (en) 2011-04-08 2015-06-02 Shell Oil Company Systems for joining insulated conductors
US9080409B2 (en) 2011-10-07 2015-07-14 Shell Oil Company Integral splice for insulated conductors
US9078655B2 (en) 2009-04-17 2015-07-14 Domain Surgical, Inc. Heated balloon catheter
US9080917B2 (en) 2011-10-07 2015-07-14 Shell Oil Company System and methods for using dielectric properties of an insulated conductor in a subsurface formation to assess properties of the insulated conductor
US9107666B2 (en) 2009-04-17 2015-08-18 Domain Surgical, Inc. Thermal resecting loop
US9131977B2 (en) 2009-04-17 2015-09-15 Domain Surgical, Inc. Layered ferromagnetic coated conductor thermal surgical tool
US9226341B2 (en) 2011-10-07 2015-12-29 Shell Oil Company Forming insulated conductors using a final reduction step after heat treating
US9265556B2 (en) 2009-04-17 2016-02-23 Domain Surgical, Inc. Thermally adjustable surgical tool, balloon catheters and sculpting of biologic materials
US20160053468A1 (en) * 2014-08-22 2016-02-25 MIchael John Gilles Electrical Pipe Thawing System and Methods of Using the Same
US9309755B2 (en) 2011-10-07 2016-04-12 Shell Oil Company Thermal expansion accommodation for circulated fluid systems used to heat subsurface formations
WO2016146100A1 (en) * 2015-03-18 2016-09-22 Klaus-Dieter Kaufmann Method for electric trace heating of pipelines for fluid transport
US9526558B2 (en) 2011-09-13 2016-12-27 Domain Surgical, Inc. Sealing and/or cutting instrument
RU175632U1 (en) * 2016-11-08 2017-12-13 Общество с ограниченной ответственностью Научно-технический центр "Интерм" Device for inductively heating resistive heat tracing

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2543882A (en) * 1949-03-05 1951-03-06 Reuben S Tice Electrical heating system for damp places
US2635168A (en) * 1950-11-04 1953-04-14 Pakco Company Eddy current heater
US3410977A (en) * 1966-03-28 1968-11-12 Ando Masao Method of and apparatus for heating the surface part of various construction materials

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE434567C (en) * 1922-01-22 1926-09-24 Otto Titus Blathy Dr Means for heating iron umiaufender hollow rolls by electrical Induktionsstroeme
DE1012710B (en) * 1956-03-16 1957-07-25 Iapatelholdia Patentverwertung Inductor for inductive heating of two to be soldered to each other parallel Tubes
US3293407A (en) * 1962-11-17 1966-12-20 Chisso Corp Apparatus for maintaining liquid being transported in a pipe line at an elevated temperature

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2543882A (en) * 1949-03-05 1951-03-06 Reuben S Tice Electrical heating system for damp places
US2635168A (en) * 1950-11-04 1953-04-14 Pakco Company Eddy current heater
US3410977A (en) * 1966-03-28 1968-11-12 Ando Masao Method of and apparatus for heating the surface part of various construction materials

Cited By (215)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3622731A (en) * 1969-07-04 1971-11-23 Chisso Corp Flexible heat-generating device
US3706872A (en) * 1970-05-15 1972-12-19 William J Trabilcy System for electrically heating fluid-conveying pipe lines and other structures
US4207896A (en) * 1970-08-13 1980-06-17 Shaw Robert F Surgical instrument having self-regulating dielectric heating of its cutting edge
US3974398A (en) * 1971-01-18 1976-08-10 Othmer Donald F Wire and steel tube as AC cable
US3780250A (en) * 1971-11-02 1973-12-18 Chisso Corp Apparatus for heating the surface of constructions
US3983360A (en) * 1974-11-27 1976-09-28 Chevron Research Company Means for sectionally increasing the heat output in a heat-generating pipe
US4091813A (en) * 1975-03-14 1978-05-30 Robert F. Shaw Surgical instrument having self-regulated electrical proximity heating of its cutting edge and method of using the same
US4364390A (en) * 1975-03-14 1982-12-21 Shaw Robert F Surgical instrument having self-regulating dielectric heating of its cutting edge and method of using the same
US4303826A (en) * 1979-02-21 1981-12-01 Chisso Corporation Shielded skin-effect current heated pipeline
US4701587A (en) * 1979-08-31 1987-10-20 Metcal, Inc. Shielded heating element having intrinsic temperature control
US4366356A (en) * 1980-03-18 1982-12-28 Chisso Corporation Compact induced current heat-generating pipe
EP0036322A1 (en) * 1980-03-18 1981-09-23 Chisso Engineering CO. LTD. Compact induced-current heat-generating pipe system and construction incorporating it
US4408117A (en) * 1980-05-28 1983-10-04 Yurkanin Robert M Impedance heating system with skin effect particularly for railroad tank cars
WO1982003305A1 (en) * 1981-03-16 1982-09-30 Ass Iris Shielded heating element having intrinsic temperature control
US4617449A (en) * 1981-10-22 1986-10-14 Ricwil, Incorporated Heating device for utilizing the skin effect of alternating current
EP0107927A1 (en) * 1982-09-30 1984-05-09 Metcal Inc. Autoregulating electrically shielded heater
US4695713A (en) * 1982-09-30 1987-09-22 Metcal, Inc. Autoregulating, electrically shielded heater
US4645906A (en) * 1985-03-04 1987-02-24 Thermon Manufacturing Company Reduced resistance skin effect heat generating system
US4791262A (en) * 1986-07-07 1988-12-13 Chisso Engineering Co Ltd Voltage transformer type electric fluid heater
GB2244414A (en) * 1990-05-24 1991-11-27 Victor Cooper Heating
US5480397A (en) * 1992-05-01 1996-01-02 Hemostatic Surgery Corporation Surgical instrument with auto-regulating heater and method of using same
US5480398A (en) * 1992-05-01 1996-01-02 Hemostatic Surgery Corporation Endoscopic instrument with disposable auto-regulating heater
US5593406A (en) * 1992-05-01 1997-01-14 Hemostatic Surgery Corporation Endoscopic instrument with auto-regulating heater and method of using same
US5611798A (en) * 1995-03-02 1997-03-18 Eggers; Philip E. Resistively heated cutting and coagulating surgical instrument
US6278095B1 (en) 1999-08-03 2001-08-21 Shell Oil Company Induction heating for short segments of pipeline systems
US6278096B1 (en) 1999-08-03 2001-08-21 Shell Oil Company Fabrication and repair of electrically insulated flowliness by induction heating
US6509557B1 (en) 1999-08-03 2003-01-21 Shell Oil Company Apparatus and method for heating single insulated flowlines
US6371693B1 (en) * 1999-08-27 2002-04-16 Shell Oil Company Making subsea pipelines ready for electrical heating
US7798221B2 (en) 2000-04-24 2010-09-21 Shell Oil Company In situ recovery from a hydrocarbon containing formation
US8485252B2 (en) 2000-04-24 2013-07-16 Shell Oil Company In situ recovery from a hydrocarbon containing formation
US8225866B2 (en) 2000-04-24 2012-07-24 Shell Oil Company In situ recovery from a hydrocarbon containing formation
US8789586B2 (en) 2000-04-24 2014-07-29 Shell Oil Company In situ recovery from a hydrocarbon containing formation
US8608249B2 (en) 2001-04-24 2013-12-17 Shell Oil Company In situ thermal processing of an oil shale formation
US6714018B2 (en) 2001-07-20 2004-03-30 Shell Oil Company Method of commissioning and operating an electrically heated pipe-in-pipe subsea pipeline
US6739803B2 (en) 2001-07-20 2004-05-25 Shell Oil Company Method of installation of electrically heated pipe-in-pipe subsea pipeline
US6707012B2 (en) 2001-07-20 2004-03-16 Shell Oil Company Power supply for electrically heated subsea pipeline
US6686745B2 (en) 2001-07-20 2004-02-03 Shell Oil Company Apparatus and method for electrical testing of electrically heated pipe-in-pipe pipeline
US6814146B2 (en) 2001-07-20 2004-11-09 Shell Oil Company Annulus for electrically heated pipe-in-pipe subsea pipeline
US20040060693A1 (en) * 2001-07-20 2004-04-01 Bass Ronald Marshall Annulus for electrically heated pipe-in-pipe subsea pipeline
US20070209799A1 (en) * 2001-10-24 2007-09-13 Shell Oil Company In situ recovery from a hydrocarbon containing formation
US8627887B2 (en) 2001-10-24 2014-01-14 Shell Oil Company In situ recovery from a hydrocarbon containing formation
US6688900B2 (en) 2002-06-25 2004-02-10 Shell Oil Company Insulating joint for electrically heated pipeline
US8200072B2 (en) * 2002-10-24 2012-06-12 Shell Oil Company Temperature limited heaters for heating subsurface formations or wellbores
US8224163B2 (en) * 2002-10-24 2012-07-17 Shell Oil Company Variable frequency temperature limited heaters
US8224164B2 (en) 2002-10-24 2012-07-17 Shell Oil Company Insulated conductor temperature limited heaters
US20040140096A1 (en) * 2002-10-24 2004-07-22 Sandberg Chester Ledlie Insulated conductor temperature limited heaters
US8238730B2 (en) 2002-10-24 2012-08-07 Shell Oil Company High voltage temperature limited heaters
US20040100273A1 (en) * 2002-11-08 2004-05-27 Liney David J. Testing electrical integrity of electrically heated subsea pipelines
US6937030B2 (en) 2002-11-08 2005-08-30 Shell Oil Company Testing electrical integrity of electrically heated subsea pipelines
US7942203B2 (en) 2003-04-24 2011-05-17 Shell Oil Company Thermal processes for subsurface formations
US8579031B2 (en) 2003-04-24 2013-11-12 Shell Oil Company Thermal processes for subsurface formations
US20050269313A1 (en) * 2004-04-23 2005-12-08 Vinegar Harold J Temperature limited heaters with high power factors
US8355623B2 (en) * 2004-04-23 2013-01-15 Shell Oil Company Temperature limited heaters with high power factors
US7860377B2 (en) 2005-04-22 2010-12-28 Shell Oil Company Subsurface connection methods for subsurface heaters
US8224165B2 (en) 2005-04-22 2012-07-17 Shell Oil Company Temperature limited heater utilizing non-ferromagnetic conductor
US8230927B2 (en) 2005-04-22 2012-07-31 Shell Oil Company Methods and systems for producing fluid from an in situ conversion process
US8070840B2 (en) 2005-04-22 2011-12-06 Shell Oil Company Treatment of gas from an in situ conversion process
US8027571B2 (en) 2005-04-22 2011-09-27 Shell Oil Company In situ conversion process systems utilizing wellbores in at least two regions of a formation
US7986869B2 (en) 2005-04-22 2011-07-26 Shell Oil Company Varying properties along lengths of temperature limited heaters
US7831133B2 (en) 2005-04-22 2010-11-09 Shell Oil Company Insulated conductor temperature limited heater for subsurface heating coupled in a three-phase WYE configuration
US7831134B2 (en) 2005-04-22 2010-11-09 Shell Oil Company Grouped exposed metal heaters
US20110170843A1 (en) * 2005-04-22 2011-07-14 Shell Oil Company Grouped exposed metal heaters
US7942197B2 (en) 2005-04-22 2011-05-17 Shell Oil Company Methods and systems for producing fluid from an in situ conversion process
US20070137857A1 (en) * 2005-04-22 2007-06-21 Vinegar Harold J Low temperature monitoring system for subsurface barriers
US8233782B2 (en) 2005-04-22 2012-07-31 Shell Oil Company Grouped exposed metal heaters
US8151880B2 (en) 2005-10-24 2012-04-10 Shell Oil Company Methods of making transportation fuel
US8606091B2 (en) 2005-10-24 2013-12-10 Shell Oil Company Subsurface heaters with low sulfidation rates
US7683296B2 (en) 2006-04-21 2010-03-23 Shell Oil Company Adjusting alloy compositions for selected properties in temperature limited heaters
US8083813B2 (en) 2006-04-21 2011-12-27 Shell Oil Company Methods of producing transportation fuel
US7793722B2 (en) 2006-04-21 2010-09-14 Shell Oil Company Non-ferromagnetic overburden casing
US7866385B2 (en) 2006-04-21 2011-01-11 Shell Oil Company Power systems utilizing the heat of produced formation fluid
US7912358B2 (en) 2006-04-21 2011-03-22 Shell Oil Company Alternate energy source usage for in situ heat treatment processes
US7785427B2 (en) 2006-04-21 2010-08-31 Shell Oil Company High strength alloys
US8192682B2 (en) 2006-04-21 2012-06-05 Shell Oil Company High strength alloys
US7673786B2 (en) 2006-04-21 2010-03-09 Shell Oil Company Welding shield for coupling heaters
US8857506B2 (en) 2006-04-21 2014-10-14 Shell Oil Company Alternate energy source usage methods for in situ heat treatment processes
US7644765B2 (en) 2006-10-20 2010-01-12 Shell Oil Company Heating tar sands formations while controlling pressure
US7717171B2 (en) 2006-10-20 2010-05-18 Shell Oil Company Moving hydrocarbons through portions of tar sands formations with a fluid
US7677314B2 (en) 2006-10-20 2010-03-16 Shell Oil Company Method of condensing vaporized water in situ to treat tar sands formations
US7703513B2 (en) 2006-10-20 2010-04-27 Shell Oil Company Wax barrier for use with in situ processes for treating formations
US7677310B2 (en) 2006-10-20 2010-03-16 Shell Oil Company Creating and maintaining a gas cap in tar sands formations
US8191630B2 (en) 2006-10-20 2012-06-05 Shell Oil Company Creating fluid injectivity in tar sands formations
US7673681B2 (en) 2006-10-20 2010-03-09 Shell Oil Company Treating tar sands formations with karsted zones
US7681647B2 (en) 2006-10-20 2010-03-23 Shell Oil Company Method of producing drive fluid in situ in tar sands formations
US7730945B2 (en) 2006-10-20 2010-06-08 Shell Oil Company Using geothermal energy to heat a portion of a formation for an in situ heat treatment process
US8555971B2 (en) 2006-10-20 2013-10-15 Shell Oil Company Treating tar sands formations with dolomite
US7841401B2 (en) 2006-10-20 2010-11-30 Shell Oil Company Gas injection to inhibit migration during an in situ heat treatment process
US7730946B2 (en) 2006-10-20 2010-06-08 Shell Oil Company Treating tar sands formations with dolomite
US7845411B2 (en) 2006-10-20 2010-12-07 Shell Oil Company In situ heat treatment process utilizing a closed loop heating system
US7730947B2 (en) 2006-10-20 2010-06-08 Shell Oil Company Creating fluid injectivity in tar sands formations
US7950453B2 (en) 2007-04-20 2011-05-31 Shell Oil Company Downhole burner systems and methods for heating subsurface formations
US7798220B2 (en) 2007-04-20 2010-09-21 Shell Oil Company In situ heat treatment of a tar sands formation after drive process treatment
US8042610B2 (en) 2007-04-20 2011-10-25 Shell Oil Company Parallel heater system for subsurface formations
US7832484B2 (en) 2007-04-20 2010-11-16 Shell Oil Company Molten salt as a heat transfer fluid for heating a subsurface formation
US7931086B2 (en) 2007-04-20 2011-04-26 Shell Oil Company Heating systems for heating subsurface formations
US9181780B2 (en) 2007-04-20 2015-11-10 Shell Oil Company Controlling and assessing pressure conditions during treatment of tar sands formations
US8662175B2 (en) 2007-04-20 2014-03-04 Shell Oil Company Varying properties of in situ heat treatment of a tar sands formation based on assessed viscosities
US7841408B2 (en) 2007-04-20 2010-11-30 Shell Oil Company In situ heat treatment from multiple layers of a tar sands formation
US7841425B2 (en) 2007-04-20 2010-11-30 Shell Oil Company Drilling subsurface wellbores with cutting structures
US8327681B2 (en) 2007-04-20 2012-12-11 Shell Oil Company Wellbore manufacturing processes for in situ heat treatment processes
US8459359B2 (en) 2007-04-20 2013-06-11 Shell Oil Company Treating nahcolite containing formations and saline zones
US7849922B2 (en) 2007-04-20 2010-12-14 Shell Oil Company In situ recovery from residually heated sections in a hydrocarbon containing formation
US8791396B2 (en) 2007-04-20 2014-07-29 Shell Oil Company Floating insulated conductors for heating subsurface formations
US8381815B2 (en) 2007-04-20 2013-02-26 Shell Oil Company Production from multiple zones of a tar sands formation
US8146669B2 (en) 2007-10-19 2012-04-03 Shell Oil Company Multi-step heater deployment in a subsurface formation
US8196658B2 (en) 2007-10-19 2012-06-12 Shell Oil Company Irregular spacing of heat sources for treating hydrocarbon containing formations
US7866386B2 (en) 2007-10-19 2011-01-11 Shell Oil Company In situ oxidation of subsurface formations
US7866388B2 (en) 2007-10-19 2011-01-11 Shell Oil Company High temperature methods for forming oxidizer fuel
US8272455B2 (en) 2007-10-19 2012-09-25 Shell Oil Company Methods for forming wellbores in heated formations
US8240774B2 (en) 2007-10-19 2012-08-14 Shell Oil Company Solution mining and in situ treatment of nahcolite beds
US8162059B2 (en) 2007-10-19 2012-04-24 Shell Oil Company Induction heaters used to heat subsurface formations
US8113272B2 (en) 2007-10-19 2012-02-14 Shell Oil Company Three-phase heaters with common overburden sections for heating subsurface formations
US8276661B2 (en) 2007-10-19 2012-10-02 Shell Oil Company Heating subsurface formations by oxidizing fuel on a fuel carrier
US8146661B2 (en) 2007-10-19 2012-04-03 Shell Oil Company Cryogenic treatment of gas
US8536497B2 (en) 2007-10-19 2013-09-17 Shell Oil Company Methods for forming long subsurface heaters
US8011451B2 (en) 2007-10-19 2011-09-06 Shell Oil Company Ranging methods for developing wellbores in subsurface formations
US8151907B2 (en) 2008-04-18 2012-04-10 Shell Oil Company Dual motor systems and non-rotating sensors for use in developing wellbores in subsurface formations
US8562078B2 (en) 2008-04-18 2013-10-22 Shell Oil Company Hydrocarbon production from mines and tunnels used in treating subsurface hydrocarbon containing formations
US8636323B2 (en) 2008-04-18 2014-01-28 Shell Oil Company Mines and tunnels for use in treating subsurface hydrocarbon containing formations
US9528322B2 (en) 2008-04-18 2016-12-27 Shell Oil Company Dual motor systems and non-rotating sensors for use in developing wellbores in subsurface formations
US8172335B2 (en) 2008-04-18 2012-05-08 Shell Oil Company Electrical current flow between tunnels for use in heating subsurface hydrocarbon containing formations
US8177305B2 (en) 2008-04-18 2012-05-15 Shell Oil Company Heater connections in mines and tunnels for use in treating subsurface hydrocarbon containing formations
US8162405B2 (en) 2008-04-18 2012-04-24 Shell Oil Company Using tunnels for treating subsurface hydrocarbon containing formations
US8752904B2 (en) 2008-04-18 2014-06-17 Shell Oil Company Heated fluid flow in mines and tunnels used in heating subsurface hydrocarbon containing formations
US8281861B2 (en) 2008-10-13 2012-10-09 Shell Oil Company Circulated heated transfer fluid heating of subsurface hydrocarbon formations
US8881806B2 (en) 2008-10-13 2014-11-11 Shell Oil Company Systems and methods for treating a subsurface formation with electrical conductors
US8353347B2 (en) 2008-10-13 2013-01-15 Shell Oil Company Deployment of insulated conductors for treating subsurface formations
US9022118B2 (en) 2008-10-13 2015-05-05 Shell Oil Company Double insulated heaters for treating subsurface formations
US9051829B2 (en) 2008-10-13 2015-06-09 Shell Oil Company Perforated electrical conductors for treating subsurface formations
US8220539B2 (en) 2008-10-13 2012-07-17 Shell Oil Company Controlling hydrogen pressure in self-regulating nuclear reactors used to treat a subsurface formation
US9129728B2 (en) 2008-10-13 2015-09-08 Shell Oil Company Systems and methods of forming subsurface wellbores
US8256512B2 (en) 2008-10-13 2012-09-04 Shell Oil Company Movable heaters for treating subsurface hydrocarbon containing formations
US8261832B2 (en) 2008-10-13 2012-09-11 Shell Oil Company Heating subsurface formations with fluids
US8267170B2 (en) 2008-10-13 2012-09-18 Shell Oil Company Offset barrier wells in subsurface formations
US8267185B2 (en) 2008-10-13 2012-09-18 Shell Oil Company Circulated heated transfer fluid systems used to treat a subsurface formation
US8327932B2 (en) 2009-04-10 2012-12-11 Shell Oil Company Recovering energy from a subsurface formation
US8851170B2 (en) 2009-04-10 2014-10-07 Shell Oil Company Heater assisted fluid treatment of a subsurface formation
US8434555B2 (en) 2009-04-10 2013-05-07 Shell Oil Company Irregular pattern treatment of a subsurface formation
US8448707B2 (en) 2009-04-10 2013-05-28 Shell Oil Company Non-conducting heater casings
US9265553B2 (en) 2009-04-17 2016-02-23 Domain Surgical, Inc. Inductively heated multi-mode surgical tool
US9220557B2 (en) 2009-04-17 2015-12-29 Domain Surgical, Inc. Thermal surgical tool
US8523850B2 (en) 2009-04-17 2013-09-03 Domain Surgical, Inc. Method for heating a surgical implement
US8523851B2 (en) 2009-04-17 2013-09-03 Domain Surgical, Inc. Inductively heated multi-mode ultrasonic surgical tool
US8506561B2 (en) 2009-04-17 2013-08-13 Domain Surgical, Inc. Catheter with inductively heated regions
US9131977B2 (en) 2009-04-17 2015-09-15 Domain Surgical, Inc. Layered ferromagnetic coated conductor thermal surgical tool
US9265556B2 (en) 2009-04-17 2016-02-23 Domain Surgical, Inc. Thermally adjustable surgical tool, balloon catheters and sculpting of biologic materials
US8491578B2 (en) 2009-04-17 2013-07-23 Domain Surgical, Inc. Inductively heated multi-mode bipolar surgical tool
US8430870B2 (en) 2009-04-17 2013-04-30 Domain Surgical, Inc. Inductively heated snare
US8425503B2 (en) 2009-04-17 2013-04-23 Domain Surgical, Inc. Adjustable ferromagnetic coated conductor thermal surgical tool
US20100268208A1 (en) * 2009-04-17 2010-10-21 Kim Manwaring Surgical scalpel with inductively heated regions
US9265554B2 (en) 2009-04-17 2016-02-23 Domain Surgical, Inc. Thermally adjustable surgical system and method
US8617151B2 (en) 2009-04-17 2013-12-31 Domain Surgical, Inc. System and method of controlling power delivery to a surgical instrument
US20100268214A1 (en) * 2009-04-17 2010-10-21 Kim Manwaring Surgical tool with inductively heated regions
US9078655B2 (en) 2009-04-17 2015-07-14 Domain Surgical, Inc. Heated balloon catheter
US8419724B2 (en) 2009-04-17 2013-04-16 Domain Surgical, Inc. Adjustable ferromagnetic coated conductor thermal surgical tool
US9320560B2 (en) 2009-04-17 2016-04-26 Domain Surgical, Inc. Method for treating tissue with a ferromagnetic thermal surgical tool
US9549774B2 (en) 2009-04-17 2017-01-24 Domain Surgical, Inc. System and method of controlling power delivery to a surgical instrument
US8414569B2 (en) 2009-04-17 2013-04-09 Domain Surgical, Inc. Method of treatment with multi-mode surgical tool
US8377052B2 (en) 2009-04-17 2013-02-19 Domain Surgical, Inc. Surgical tool with inductively heated regions
US9730749B2 (en) 2009-04-17 2017-08-15 Domain Surgical, Inc. Surgical scalpel with inductively heated regions
US8292879B2 (en) 2009-04-17 2012-10-23 Domain Surgical, Inc. Method of treatment with adjustable ferromagnetic coated conductor thermal surgical tool
US9265555B2 (en) 2009-04-17 2016-02-23 Domain Surgical, Inc. Multi-mode surgical tool
US8523852B2 (en) 2009-04-17 2013-09-03 Domain Surgical, Inc. Thermally adjustable surgical tool system
US9107666B2 (en) 2009-04-17 2015-08-18 Domain Surgical, Inc. Thermal resecting loop
US20110124223A1 (en) * 2009-10-09 2011-05-26 David Jon Tilley Press-fit coupling joint for joining insulated conductors
US8816203B2 (en) 2009-10-09 2014-08-26 Shell Oil Company Compacted coupling joint for coupling insulated conductors
US20110132661A1 (en) * 2009-10-09 2011-06-09 Patrick Silas Harmason Parallelogram coupling joint for coupling insulated conductors
US8485847B2 (en) 2009-10-09 2013-07-16 Shell Oil Company Press-fit coupling joint for joining insulated conductors
US20110124228A1 (en) * 2009-10-09 2011-05-26 John Matthew Coles Compacted coupling joint for coupling insulated conductors
US20110134958A1 (en) * 2009-10-09 2011-06-09 Dhruv Arora Methods for assessing a temperature in a subsurface formation
US8257112B2 (en) 2009-10-09 2012-09-04 Shell Oil Company Press-fit coupling joint for joining insulated conductors
US9466896B2 (en) 2009-10-09 2016-10-11 Shell Oil Company Parallelogram coupling joint for coupling insulated conductors
US8356935B2 (en) 2009-10-09 2013-01-22 Shell Oil Company Methods for assessing a temperature in a subsurface formation
US8809750B2 (en) * 2010-01-25 2014-08-19 Türk & Hillinger GmbH Electric heating device
US20110180529A1 (en) * 2010-01-25 2011-07-28 Schlipf Andreas Electric heating device
US8939207B2 (en) 2010-04-09 2015-01-27 Shell Oil Company Insulated conductor heaters with semiconductor layers
US8701768B2 (en) 2010-04-09 2014-04-22 Shell Oil Company Methods for treating hydrocarbon formations
US8485256B2 (en) 2010-04-09 2013-07-16 Shell Oil Company Variable thickness insulated conductors
US8967259B2 (en) 2010-04-09 2015-03-03 Shell Oil Company Helical winding of insulated conductor heaters for installation
US9399905B2 (en) 2010-04-09 2016-07-26 Shell Oil Company Leak detection in circulated fluid systems for heating subsurface formations
US8701769B2 (en) 2010-04-09 2014-04-22 Shell Oil Company Methods for treating hydrocarbon formations based on geology
US9022109B2 (en) 2010-04-09 2015-05-05 Shell Oil Company Leak detection in circulated fluid systems for heating subsurface formations
US9033042B2 (en) 2010-04-09 2015-05-19 Shell Oil Company Forming bitumen barriers in subsurface hydrocarbon formations
US8859942B2 (en) 2010-04-09 2014-10-14 Shell Oil Company Insulating blocks and methods for installation in insulated conductor heaters
US8631866B2 (en) 2010-04-09 2014-01-21 Shell Oil Company Leak detection in circulated fluid systems for heating subsurface formations
US8739874B2 (en) 2010-04-09 2014-06-03 Shell Oil Company Methods for heating with slots in hydrocarbon formations
US8833453B2 (en) 2010-04-09 2014-09-16 Shell Oil Company Electrodes for electrical current flow heating of subsurface formations with tapered copper thickness
US8820406B2 (en) 2010-04-09 2014-09-02 Shell Oil Company Electrodes for electrical current flow heating of subsurface formations with conductive material in wellbore
US8502120B2 (en) 2010-04-09 2013-08-06 Shell Oil Company Insulating blocks and methods for installation in insulated conductor heaters
US9127523B2 (en) 2010-04-09 2015-09-08 Shell Oil Company Barrier methods for use in subsurface hydrocarbon formations
US9127538B2 (en) 2010-04-09 2015-09-08 Shell Oil Company Methodologies for treatment of hydrocarbon formations using staged pyrolyzation
US8586866B2 (en) 2010-10-08 2013-11-19 Shell Oil Company Hydroformed splice for insulated conductors
US8586867B2 (en) 2010-10-08 2013-11-19 Shell Oil Company End termination for three-phase insulated conductors
US8732946B2 (en) 2010-10-08 2014-05-27 Shell Oil Company Mechanical compaction of insulator for insulated conductor splices
US9755415B2 (en) 2010-10-08 2017-09-05 Shell Oil Company End termination for three-phase insulated conductors
US8857051B2 (en) 2010-10-08 2014-10-14 Shell Oil Company System and method for coupling lead-in conductor to insulated conductor
US8943686B2 (en) 2010-10-08 2015-02-03 Shell Oil Company Compaction of electrical insulation for joining insulated conductors
US9337550B2 (en) 2010-10-08 2016-05-10 Shell Oil Company End termination for three-phase insulated conductors
US9429263B2 (en) * 2011-01-28 2016-08-30 Sinvent As System and system elements for direct electrical heating of subsea pipelines
US20140016918A1 (en) * 2011-01-28 2014-01-16 Sinvent As System and system elements for direct electrical heating of subsea pipelines
US8915909B2 (en) 2011-04-08 2014-12-23 Domain Surgical, Inc. Impedance matching circuit
US9149321B2 (en) 2011-04-08 2015-10-06 Domain Surgical, Inc. System and method for cooling of a heated surgical instrument and/or surgical site and treating tissue
US9016370B2 (en) 2011-04-08 2015-04-28 Shell Oil Company Partial solution mining of hydrocarbon containing layers prior to in situ heat treatment
US9048653B2 (en) 2011-04-08 2015-06-02 Shell Oil Company Systems for joining insulated conductors
US8932279B2 (en) 2011-04-08 2015-01-13 Domain Surgical, Inc. System and method for cooling of a heated surgical instrument and/or surgical site and treating tissue
US8858544B2 (en) 2011-05-16 2014-10-14 Domain Surgical, Inc. Surgical instrument guide
WO2012159221A1 (en) 2011-05-20 2012-11-29 Bacab S.A. Electrical cable and application of this cable
US9526558B2 (en) 2011-09-13 2016-12-27 Domain Surgical, Inc. Sealing and/or cutting instrument
US9080409B2 (en) 2011-10-07 2015-07-14 Shell Oil Company Integral splice for insulated conductors
US9226341B2 (en) 2011-10-07 2015-12-29 Shell Oil Company Forming insulated conductors using a final reduction step after heat treating
US9080917B2 (en) 2011-10-07 2015-07-14 Shell Oil Company System and methods for using dielectric properties of an insulated conductor in a subsurface formation to assess properties of the insulated conductor
US9309755B2 (en) 2011-10-07 2016-04-12 Shell Oil Company Thermal expansion accommodation for circulated fluid systems used to heat subsurface formations
US20160053468A1 (en) * 2014-08-22 2016-02-25 MIchael John Gilles Electrical Pipe Thawing System and Methods of Using the Same
WO2016146100A1 (en) * 2015-03-18 2016-09-22 Klaus-Dieter Kaufmann Method for electric trace heating of pipelines for fluid transport
RU175632U1 (en) * 2016-11-08 2017-12-13 Общество с ограниченной ответственностью Научно-технический центр "Интерм" Device for inductively heating resistive heat tracing

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